GNUmakefile

SHELL = sh
PROJECT_ROOT := $(patsubst %/,%,$(dir $(abspath $(lastword $(MAKEFILE_LIST)))))

GO_LDFLAGS ?= -s -w
CGO_ENABLED ?= 1
GO_TAGS := osusergo
INSTALLATION_PATH ?= /usr/local/bin


default: clean bin/seashell 
					
bin/seashell: $(SOURCE_FILES) ## Build seashell CLI executable
	@echo "==> Building the seashell CLI executable..."
	CGO_ENABLED=$(CGO_ENABLED) GOOS=linux GOARCH=amd64 \
			go build \
			-trimpath \
			-tags "$(GO_TAGS)" \
	 		-ldflags "$(GO_LDFLAGS)" \
			-o "$@"

release: GO_LDFLAGS := "-linkmode external -extldflags '-static' -s -w"
release: $(SOURCE_FILES) ## Build release version of the seashell CLI executable
	@echo "==> Building the release version of the seashell CLI executable..."
	@$(MAKE) GO_LDFLAGS=$(GO_LDFLAGS)


.PHONY: install
install: $(SOURCE_FILES) ## Build and install the seashell CLI executable on the system
	@echo "==> Installing CLI executable at $(INSTALLATION_PATH)/seashell..."
	@sudo cp $(PROJECT_ROOT)/bin/seashell $(INSTALLATION_PATH)/seashell				

.PHONY: clean
clean: ## Remove build artifacts
	@echo "==> Cleaning build artifacts from $(PROJECT_ROOT)/bin/..."
	@go mod tidy
	@rm -rf "$(PROJECT_ROOT)/bin/"

HELP_FORMAT="    \033[36m%-25s\033[0m %s\n"
EG_FORMAT="    \033[36m%s\033[0m %s\n"
.PHONY: help
help: ## Display this usage information
	@echo "Valid targets:"
	@grep -E '^[^ ]+:.*?## .*$$' $(MAKEFILE_LIST) | \
		sort | \
		awk 'BEGIN {FS = ":.*?## "}; \
			{printf $(HELP_FORMAT), $$1, $$2}'
	@echo ""
	@echo "Examples:"
	@printf $(EG_FORMAT) "~${PWD}" "$$ make bin/seashell"
	@printf $(EG_FORMAT) "~${PWD}" "$$ make install"